add log source to home api

[nikhilsinhaparseable]

Summary by CodeRabbit

• New Features
  • Stream metadata and dataset listings now include dataset format information, improving visibility into each stream's format and characteristics.
  • Home/stream responses now return format detail alongside existing metadata and timing info for clearer context.

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[coderabbitai]

Walkthrough

Adds a dataset_format: LogSource field to DataSet, updates StreamMetadataResponse and get_stream_metadata to return the new value, and threads that value through generate_home_response when constructing home API responses.

Changes

Cohort / File(s)	Summary
Home metadata enrichment src/prism/home/mod.rs	Imported LogSource/LogSourceEntry. Extended DataSet with dataset_format: LogSource. Changed StreamMetadataResponse and get_stream_metadata to include LogSource in returned tuple. get_stream_metadata now extracts dataset_format from stream_jsons.first().log_source.first().log_source_format.clone() and generate_home_response destructures and populates the new field.

Sequence Diagram(s)

(omitted — change is internal to a single module and does not introduce a multi-component control flow)

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• add dataset name and type to home api response #1271: Also modifies src/prism/home/mod.rs to extend dataset/home response handling and touches similar dataset fields.
• fix: home api #1273: Changes how the home handler retrieves and uses stream log_source information in the same module.
• add telemetry type to a dataset #1392: Adjusts DataSet/stream metadata and generate_home_response in src/prism/home/mod.rs, affecting the same code paths.

Suggested labels

for next release

Suggested reviewers

• praveen5959
• parmesant

Poem

🐰 I found a LogSource in the metadata hay,
I tucked it in DataSet and hopped on my way.
Tuples grew longer, fields snug and neat,
Home responses now carry the format so sweet.
🥕✨

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description is empty; required sections like Description, rationale, key changes, and testing/documentation checklist are all missing.	Add a detailed description covering the goal, rationale, key changes, and complete the provided checklist for testing, comments, and documentation.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding log source information to the home API response.

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✨ Finishing touches

• 📝 Generate docstrings

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@src/prism/home/mod.rs`:
- Around line 256-259: The assignment of dataset_format using
stream_jsons[0].log_source[0].log_source_format is unsafe and discards
additional sources; instead, defend against empty lists and represent multiple
formats explicitly: when extracting dataset_format from stream_jsons (and
specifically from the log_source field), check if log_source is empty and handle
that case (e.g., set dataset_format to None or a sentinel like "unknown"), and
if there are multiple entries, either return a Vec of formats or a distinct
"mixed" value rather than silently taking the first element; update the code
that references dataset_format to accept the chosen representation and use
methods on stream_jsons, log_source, and dataset_format to locate the changes.